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I was wondering if Tuscany is part of the implmentation of the SCA features in websphere process server 6.1. And if so, whicht version of the spec (1.0?) and tuscany implementation (1.01?) will be used.

Since the SOA Feature Pack is still Beta and WPS 6.1 is final, WPS 6.1 does not incorporate the SOA Feature Pack (but does incorporate WAS 6.1). The plan is still to have a release of WPS that will incorporate the SOA Feature Pack and therefore Tuscany and therefore a standardized impl of SCA and SDO, but this is all taking longer than planned and therefore is not part of WPS 6.1. Therefore WPS 6.1 contains the same proprietary impl of SCA and SDO in WPS 6.0.x, which will make backwards compatibility and therefore migration of your existing code easier.